Improvement in let-off mechanism for looms



Ttime sata EPHRAIM MCDANIEL, OF LOWELL, MASSACHUSETTS.

Letters Patent .N 98,082,

dated December 21,1869.

IMPRQVEMENT IN LT-OFF, MECHANISM FOR LQOMS.

The Schedule referred. to in these Letters Patent and making part of the same.

To all whom it may concern:

Be it known that I, EPHRAIM MCDANIEL, of Lowell, in the county of Middlesex, and State of Massachusetts, have invented new `and useful Improvements in -SelfLOperat-ing Friction Let-Oli` for Looms; and I do hereby declare that the following is a tull and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

To enable others skilled in the art to make and use my invention, l will proceed to describe its construction and operation.

Figure l represents a plan of a loom, with my improved device attached.

Figure 2 represents a side elevation of the same.

Figure 3 represents a vertical section of the same.

Similar letters in the different figures indicate cor-v responding parts. f v

a a represents the loom-sides, which receive the yarn-beam l1 on suitable bearings or boxes at each end..

This yarn-beam l) is provided at each end wit-lr beam-heads c c, over and around one of which passes the friction-strap, cord, or cha-in d, one end of which is permanently secured and fastened to the girt e the chain d is then passed twice around the head c, in the direct-ion in which the yarn-beam unwinds, as shown by the arrow in iig. 3, so that the binding traction of the chain or strapon the head, will be from the iixed end thereof, thereby producing greater nniformity of friction, and requiring a much lighter weight to produce the saine amount of friction, and obviatingthe unsteady vibration ot the weight lever, as produced by the usual arrangement ofthe frictionstrap running in the opposite direction, thence over the friction-pulley j, which is provided with a stand, j", and secured to the girt c, and fastened to the inclined lever g.

This lever g, at one end, is hinged by'a pivot to. the loom-side a, and in an inclined position.

Sliding on this lever g, loosely above the point of fastening the chain d, is the weight h, which is provided with an eye, i, at'its upper edge, to which is at tat-hed the cord or chain j.

' This cord passes partially around the guide-pulley k, which is provided with suitable bearings in stand l, which stand is fastened to the outside of the girt c.

From this pulley lc, the cordj passes at a right angle over the guide-pulley m, which is also furnished `with bearings in sta-nd n, like the former, and is secured to the inside'of the girt c.

' The end of the c'ord j is then fastened to the lower yarn, is inclined from the direction of its movement,y

substantially as shown in tig. 3. f

This arrangement producesa movement ofthe arm, and consequently ofthe Weight, greater than the actual diminution of the radius ofthe roll of yarn 4hence the leverage of the weight can be more rapidly changed, and by varying-the inclination of the arm, it can be nicely' adjusted to produce the requisite uniformity of tei'ision on the yarn-beam.

Operation.

The yarn-beam b, being filled with yarn, even withA the heads c c, the strap, cord, or chain d, is adjusted and secured to the inclined lever g. V

The weight tjs slid up on the lever g, so that the arm or fork o can be depressed suiiiciently to come in contact with the yarn on the beam b.

The weight h is so graduated in its number of pounds, and its distance from the fulcrum, as to give sii-ed thickness ofthe cloth.

The loom is then set in motion, and as the warp unwinds from the yarn-beam b, the diameter of the yarn on the same is reduced, which allows the arm o to move gradually toward the centre of the beam l).

This action ot' the armor fork o allows the weight li, hy aid of the cord or chain j, which passes over and around the guide-pulleys m and k, to descend on the inclined lever y toward its fulcrum, which reduces the friction on the yarn-beam b, corresponding with the increased power or force to unwind the same, which result-s in a perfect and uniform distribution of the filling during the entire working or usingv npof the yarn on the beam b. l

What I claim as myinvention, and desire to secure hy Letters Patent, is

The arrangement of the strap or chain d, drawing from the tixed end thereof, and in the direction in which the yarn-beam turns, and the arm o having au inclined bearing on the yarn-roll, in combination with the desired tension to the warp for the proper and det-he lever g, weight li, and cord'j,`as and for the purpose herein specified. i

` EPHRAIM MCDANIEL.

Witnesses:

WILLIAM W. GLADWIN, GEO. E. Pnvnv.l 

